map<B> method

@override IList<B> map<B>(B f(A a))

Implementation

@override IList<B> map<B>(B f(A a)) {
  final IList<B> bNil = nil();
  if (!_isCons()) {
    return bNil;
  }
  Cons<B> last = new Cons(f(_unsafeHead()), bNil);
  if (!_unsafeTail()._isCons()) {
    return last;
  }
  final result = last;
  var current = _unsafeTail();
  while (current._isCons()) {
    final next = new Cons(f(current._unsafeHead()), bNil);
    last._unsafeSetTail(next);
    last = next;
    current = current._unsafeTail();
  }
  return result;
}